CN115709288A - Preparation method of silver tin oxide lanthanum oxide contact material - Google Patents
Preparation method of silver tin oxide lanthanum oxide contact material Download PDFInfo
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Abstract
The invention discloses a preparation method of a silver tin oxide lanthanum oxide contact material, and belongs to the technical field of alloy contact materials. The preparation method of the contact material comprises the following steps: 1) Calculating Ag ingot, la ingot, additive and SnO required according to contact materials required to be prepared 2 Weighing the powder for later use; 2) Melting Ag ingots, adding La ingots and additives, continuously melting, and atomizing to prepare Ag alloy powder; 3) Heating Ag alloy powder in air to 600-700 ℃ for oxidation to obtain oxidized alloy powder; 4) Mixing oxide alloy powder with SnO 2 Mixing the powders to obtain mixed powder; 5) Mixing the powder, molding, and introducing airSintering in the atmosphere at the temperature of 890-910 ℃ to obtain a sintered ingot; 6) Extruding the obtained sintered ingot to obtain a wire or a plate; 7) The resulting wire or sheet is processed into a contact. The method disclosed by the invention combines atomization and powder mixing processes, so that the production period is short, and the obtained product is uniform in structure and good in performance.
Description
Technical Field
The invention relates to a preparation method of an alloy contact material, in particular to a preparation method of a silver tin oxide lanthanum oxide contact material.
Background
Silver tin oxide (AgSnO) 2 ) Is prepared from silver (Ag) and tin oxide (SnO) 2 ) A metal matrix composite material prepared by taking the metal matrix composite material as a main component. The contact material of silver tin oxide and rare earth oxide is AgSnO 2 The material is prepared by adding sufficient rare earth oxide, because the rare earth oxide has the advantages of good thermal stability, high melting point, difficult decomposition under the action of electric arc and the like, the addition of the rare earth oxide can reduce the loss of the oxide under the action of electric arc, increase the viscosity of a silver molten pool, reduce silver splashing, further improve the arc erosion resistance and fusion welding resistance of the contact material and prolong the service life of the contact material, therefore, the silver tin oxide rare earth oxide contact material can be used for sealing low-voltage electric appliances such as relays, heavy-current contactors and the like.
At present, the preparation process of the silver tin oxide rare earth oxide contact material mainly comprises an internal oxidation method, a powder metallurgy method and a chemical codeposition method, wherein the chemical codeposition method has complex working procedures, complex operation and long powder preparation period and is not suitable for mass production. The powder metallurgy method (i.e. powder mixing method) is to mix Ag powder and SnO 2 The powder, the rare earth oxide powder and other additive powder are mixed together by a powder mixing device, then are formed and sintered, and then are subjected to hot extrusion to obtain wire or plate, and further are processed into rivet-shaped contacts or sheet-shaped contacts. Although the method has simple process and easy operation, when multiple components are mixed, the mixing process is complex, and the phenomena of uneven mixing and oxide aggregation are easy to occur.
The process for preparing silver tin oxide rare earth oxide material by internal oxidation method includes alloy internal oxidation method and powder internal oxidation method. The alloy internal oxidation method is characterized in that Ag ingots, sn ingots and rare earth ingots are smelted under the vacuum condition to obtain uniform solution, then the uniform solution is cast into alloy ingots, alloy wires are obtained by hot extrusion after the surface skin is turned off, then the alloy wires are drawn to a certain specification, then the alloy wires are oxidized, cut and formed after oxidation, and then the alloy wires are extruded and drawn to be processed into rivet-type contacts or sheet-type contacts. The main defects of the alloy internal oxidation method are that the smelting is carried out under the vacuum condition, the requirement on equipment is high, and the process is complex; the production process is multiple, and the production period is long; moreover, the alloy wire is difficult to oxidize, the oxidation needs to be carried out at high temperature and high pressure, and the oxidation time is long. The powder internal oxidation method is characterized in that Ag ingots, sn ingots and rare earth ingots are smelted to obtain uniform solution, then atomization is carried out to obtain alloy powder, then oxidation is carried out at a certain temperature and under a certain pressure, the oxidized powder is formed and sintered, wires or plates are obtained by hot extrusion of the sintered ingots, and then rivet-type contacts or sheet-type contacts are processed. The method has the main defects that the atomized alloy powder is difficult to oxidize due to the high total content of tin and rare earth, a certain oxygen pressure and a high temperature are required to be provided, and the step-by-step oxidation is required to prevent the powder from caking due to severe oxidation, so that the oxidation is not uniform and the processability of the material is influenced. The invention patent with publication number CN101984117B discloses a preparation method of a mixed rare earth oxide modified silver tin oxide electric contact material, which comprises the following steps: (1) Mixing Ag with water 2 Treating the O powder for 0.5 to 2 hours at the temperature of between 100 and 200 ℃; (2) Placing the mixture of rare earth elements RE, ag and Sn in a jet codeposition vacuum intermediate frequency smelting furnace for alloying to obtain an alloy melt; the rare earth element RE is La, sm and Y; (3) Opening an atomizing gas valve when the temperature of the alloy melt in the step (2) reaches 100-200 ℃, pouring the alloy melt into a heat-preserving bag, and starting a powder conveying device to convey the Ag treated in the step (1) 2 Spraying and codepositing O powder to obtain AgSnRE/Ag 2 An O composite material; the Ag is 2 The conveying amount of the O powder is the sum of 2 times of the molar amount of Sn and 3/2 times of the molar amount of the rare earth element RE; (4) Mixing the AgSnRE/Ag in the step (3) 2 The O composite material is subjected to in-situ chemical reaction for 4 to 8 hours at the temperature of between 400 and 800 ℃ under the vacuum condition to prepare the AgSnO 2 RE 2 O 3 Composite materials, i.e. modified AgSnO 2 A composite material; the modified AgSnO 2 SnO in composite materials 2 Is 3-15% by mass, RE 2 O 3 The mass percentage of the Ag-Ag alloy is 0.1-5 percent, and the balance is Ag; (5) The modified AgSnO in the step (4) 2 And extruding the composite material to obtain the mixed rare earth oxide modified silver tin oxide electric contact material in the shape of a bar or a plate, further rolling or drawing, and finally processing into a mixed rare earth oxide modified silver tin oxide electric contact material in the shape of a sheet, a wire, a special-shaped material or a contact according to application requirements. In the invention, the mixture of the rare earth elements RE, ag and Sn is smelted together, so that the burning loss of the rare earth elements RE is easily caused, and the actual content of the obtained product is reduced. On the other hand, the invention adopts advanced processing technologies such as jet codeposition, in-situ chemical reaction and the like, has high requirements on process conditions, complex process and high equipment input cost, is not suitable for mass production, and the tissue uniformity of products is required to be improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a silver tin oxide lanthanum oxide contact material, which adopts the combination of atomization and powder mixing processes, has short production period and uniform product structure and good performance.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a silver tin oxide lanthanum oxide contact material comprises the following steps:
1) Calculating Ag ingot, la ingot, additive and SnO required according to contact materials required to be prepared 2 Weighing the powder for later use;
2) Placing an Ag ingot in a smelting furnace, smelting to a molten state, adding an La ingot and an additive, continuously smelting to form uniform alloy melt, and then atomizing to prepare Ag alloy powder;
3) Placing the obtained Ag alloy powder in an oxidation furnace, heating to 600-700 ℃ in air atmosphere for oxidation to obtain oxidized alloy powder;
4) The obtained oxidized alloy powder and SnO 2 Uniformly mixing the powder to obtain mixed powder;
5) The obtained mixed powder is sintered in the environment with the air atmosphere and the temperature of 890-910 ℃ after being molded, and a sintered ingot is obtained;
6) Heating the obtained sintered ingot, and then extruding the sintered ingot at a large extrusion ratio to obtain a wire or plate with a required specification;
7) The wire or plate is further processed into rivet-type or sheet-type contacts.
Preferably, the additive involved in the above method is one or a combination of two or more selected from Bi, cu and Te.
Preferably, the time for oxidation in the step 3) is controlled to be 1.5 to 3 hours.
Preferably, the sintering time in the step 5) is controlled to be 8 to 10 hours.
Preferably, the extrusion ratio in the extrusion in the above step 6) is not less than 100, more preferably 150 to 400.
Compared with the prior art, the invention combines the atomization method and the powder mixing method, simplifies the process, shortens the production period, reduces the cost, and can prepare the silver tin oxide lanthanum oxide contact material with uniform tissue, good fusion welding resistance and arc erosion resistance. The method comprises the following specific steps:
1. the silver-lanthanum alloy powder containing or not containing additives is obtained by atomization through smelting and atomizing equipment, and as lanthanum and the additives are all active metals (particularly rare earth element lanthanum), the silver-lanthanum alloy powder is easy to oxidize, and the content of lanthanum and the content of the additives are not high, the alloy powder can be completely oxidized at a lower temperature in a shorter time under the air atmosphere, and the problem of difficult oxidation caused by high tin content in silver-tin-lanthanum alloy wires or alloy powder in an internal oxidation method is solved.
2. Mixing oxidized Ag-La alloy powder with or without additive and SnO 2 The powder is mixed, so that the powder mixing components are reduced, the powder mixing process is simplified, and the problems of non-uniform mixed powder and oxide aggregation caused by multi-component mixing are avoided.
3. The atomization and powder mixing process method adopted to prepare the silver tin oxide rare earth oxide material has low requirements on equipment and process conditions, is easy to realize, has short process flow and short production period, and reduces the cost.
Detailed Description
The invention relates to a preparation method of a silver tin oxide lanthanum oxide contact material, which comprises the following steps:
1) Calculating Ag ingot, la ingot, additive and SnO required according to contact materials required to be prepared 2 Weighing the powder for later use;
2) Placing an Ag ingot in a smelting furnace, smelting to a molten state, adding an La ingot and an additive, continuously smelting to form uniform alloy melt, and then atomizing to prepare Ag alloy powder;
3) Placing the obtained Ag alloy powder in an oxidation furnace, heating to 600-700 ℃ in air atmosphere for oxidation to obtain oxidized alloy powder;
4) The obtained oxidized alloy powder and SnO 2 Uniformly mixing the powder to obtain mixed powder;
5) The obtained mixed powder is placed in an air atmosphere and sintered at the temperature of 890-910 ℃ to obtain a sintered ingot;
6) Heating the obtained sintered ingot, and then extruding at a large extrusion ratio to obtain a wire or plate with a required specification;
7) The wire or plate is further processed into a rivet-type contact or a sheet-type contact.
The silver tin oxide lanthanum oxide contact material prepared by the method comprises the following components in percentage by weight: snO 2 8～10w/w％、La 2 O 3 1-4 w/w%, additive 0-1 w/w%, and the balance of Ag.
The purity of the Ag ingot, the La ingot, the metal and various additives used in the method is more than or equal to 99.95w/w percent, and the used SnO 2 The purity of the powder was 99.50w/w%. The additive is selected from one or more of Bi, cu and Te.
In step 2) of the method of the present invention, the Ag ingot is usually placed in a crucible and then placed in a smelting furnace for smelting. In the step, the smelting operation in the smelting furnace is the same as that in the prior art, specifically, the smelting is carried out at the temperature of 1000-1200 ℃, and after the La ingot and the additive are added, the heat preservation is continued for 8-12 min. Before smelting, a layer of charcoal is preferably paved on the surface of the silver ingot, so that the charcoal can be used for preserving heat and preventing air suction on one hand, and lanthanum and additives added into the container in the later smelting period are prevented from being oxidized on the other hand, and therefore, the paved charcoal can completely cover the materials in the container. The charcoal coating layer is usually 1 to 3cm thick. Furthermore, in order to avoid the loss or oxidation of lanthanum in the adding process, silver foil can be used for coating or AgLa pseudo alloy with high lanthanum content is prepared in advance and then the materials are fed. The alloy solution obtained by smelting is prepared into Ag alloy powder by adopting the conventional water atomization operation.
From the view of deslagging, the added La ingot and the additive are melted, then the temperature is continuously raised to 1300-1400 ℃, 40-60 g of slagging agent (such as boric acid) is added for slagging, and the charcoal and the slag on the surface of the alloy melt are fished clean.
In the step 3) of the method, the silver-lanthanum alloy powder obtained by atomization is easy to oxidize because lanthanum and additives are active metals (particularly rare earth element lanthanum), and the lanthanum and additives have low content, so that the alloy powder can be completely oxidized at a lower temperature (600-700 ℃) in a shorter time (1.5-3 h) in an air atmosphere, and the problem of difficult oxidation caused by high tin content in the silver-tin-lanthanum alloy wire or the alloy powder in an internal oxidation method is solved.
In the step 4) of the method, the conventional equipment is adopted to realize the oxidation of the alloy powder and the SnO 2 And (3) uniformly mixing the powder, such as placing the powder and the powder in a mixer to mix and stir for 1.5-2 h.
In step 5) of the method of the invention, the mixed powder is formed by conventional isostatic pressing, and the diameter of the forming spindle is preferably equal to that of the forming spindle
Unlike conventional pre-oxidized oxide sintering of atomized powder, in the present application, since the components other than silver have already formed oxides, the sintering does not need to provide oxygen pressure, and the sintering can be completed using atmospheric air atmosphere. Sintering timePreferably 8-10 h.
In step 6) of the process according to the invention, the extrusion ratio during extrusion is greater than or equal to 100, more preferably between 150 and 400. Preferably, a horizontal extruder is adopted for high-extrusion-ratio extrusion, and in order to achieve better material utilization rate and meet the subsequent processing requirement, the specification of the extrusion container is preferably adopted
Of the gauge, the extrusion wire die gauge is preferably used
The specification is as follows.
Further processing the wire obtained by extrusion in the step 6) into a rivet-type contact or a sheet-shaped contact according to a conventional method, wherein the wire obtained by extrusion is subjected to drawing annealing to obtain a finished wire, and then further processed into the rivet-type contact; the sheet obtained by extrusion is rolled and annealed, and then further processed into the sheet-shaped contact.
In order to better explain the technical solution of the present invention, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.
Example 1: preparation of
AgSnO (C) 2 (10)La 2 O 3 (1.5)Bi 2 O 3 (0.5) wire rod
1) According to the AgSnO to be prepared 2 (10)La 2 O 3 (1.5)Bi 2 O 3 (0.5) contact Material (SnO) 2 Is 10% by mass, la 2 O 3 Is 1.5 percent, bi 2 O 3 0.5% by mass, the balance being Ag), preparing pure Ag ingot, la ingot, bi block, snO 2 Powder and other raw materials for standby;
2) Putting a pure Ag ingot into a graphite crucible, simultaneously spreading a layer of blocky charcoal on the surface, putting the pure Ag ingot into a smelting furnace, heating and smelting the Ag ingot to a molten state at 1050 ℃, then putting a La ingot into a molten Ag solution in the molten state, adding a Bi block, keeping the temperature and melting, heating to 1200 ℃, keeping the temperature and diffusing for 10min, continuing heating to 1350 ℃, adding 50g of boric acid for slagging, fishing out the charcoal and slag on the surface of the molten solution, pouring an alloy solution into a tundish for water atomization powder preparation, drying the obtained powder for 8h at 150 ℃, and sieving the dried powder with a 300-mesh sieve to obtain Ag alloy powder;
3) Putting the obtained Ag alloy powder into a stainless steel disc, putting the stainless steel disc into an oxidation furnace, and oxidizing at the temperature of 650 ℃ in the air atmosphere for 2 hours to obtain completely oxidized alloy powder;
4) Mixing the obtained oxidized alloy powder with SnO 2 Mixing the powder in a mixer for 120min to obtain mixed powder;
5) The obtained mixed powder is pressed into powder by adopting isostatic pressing equipment
The ingot blank is placed in an oxidation sintering furnace to be sintered and diffused for 10 hours under the conditions of air atmosphere and temperature of 910 ℃ to obtain a sintered ingot;
6) Heating the obtained sintered ingot to 750 ℃, feeding the sintered ingot into an extrusion cylinder of a horizontal extruder, extruding the sintered ingot according to an extrusion ratio of 320, and extruding the sintered ingot to obtain the sintered ingot with the diameter of
The wire rod of (1);
7) Drawing the wire rod obtained in the step 6) by a wire drawing machine in multiple passes
And obtaining the wire for preparing the contact.
AgSnO prepared in this example 2 (10)La 2 O 3 (1.5)Bi 2 O 3 (0.5) wire rod with a density of 9.85g/cm 3 The resistivity was 2.25. Mu. Omega. Cm, the tensile strength was 300MPa, and the elongation after fracture was 20%.
The wire prepared in example 1 was conventionally fabricated into a rivet-type contact
The obtained rivet-type contact and the contact made of the same components by the conventional alloy internal oxidation method
And (4) carrying out fusion welding resistance detection on the rivet-type contact. A relay simulation test device is used for detection, and the specific test method comprises the following steps: the movable contact and the static contact are arranged at a testing station, 220V alternating current voltage is applied, the current is 20A, 2 ten thousand on-off are carried out, 2 ten thousand fusion welding force data are obtained, the average value of the fusion welding force data is calculated to be the fusion welding force of the group of contacts, 5 groups of each material are tested, and the average value is the fusion welding force of the material. After testing for both materials, the results were as follows: the contact material prepared from the wire of example 1 had a fusion welding force of 3.33g, and the contact material prepared from the alloy internal oxidation method had a fusion welding force of 3.92g, which was reduced by 15%.
Example 2: preparation of
AgSnO (C) 2 (10)La 2 O 3 (1.5)Bi 2 O 3 (0.5) sheet-like contactor step 1) to step 5) were the same as in example 1;
6) Heating the obtained sintered ingot to 750 ℃ under the hydrogen protection condition, feeding the sintered ingot into an extrusion cylinder of a horizontal extruder, extruding according to the extrusion ratio of 125, and extruding to obtain a plate with Lmm multiplied by 14.5mm multiplied by 3.5 mm;
7) Further rolling the plate obtained in the step 6) to a strip with the specification of Lmm multiplied by 21mm multiplied by 1.5mm by a rolling mill in multiple passes, and stamping the strip into strips by a stamping machine
The sheet contact of (1).
AgSnO prepared in this example 2 (10)La 2 O 3 (1.5)Bi 2 O 3 (0.5) sheet-like contact having a density of 9.85g/cm 3 The resistivity was 2.27. Mu. Omega. Cm, and the hardness HV was 60.
Example 3: preparation of
AgSnO (C) 2 (8)La 2 O 3 (4)Bi 2 O 3 (0.5) wire rod
1) According to the AgSnO to be prepared 2 (8)La 2 O 3 (4)Bi 2 O 3 (0.5) contact Material (SnO) 2 Is 8% by mass, la 2 O 3 Is 4% by mass, bi 2 O 3 0.5% by mass, the balance being Ag), preparing pure Ag ingot, la ingot, bi block, snO 2 Powder and other raw materials for standby;
2) Putting a pure Ag ingot into a graphite crucible, simultaneously spreading a layer of blocky charcoal on the surface, putting the pure Ag ingot into a smelting furnace, heating and smelting the Ag ingot to a molten state by heating the Ag ingot to 1050 ℃, then putting an La ingot into the molten Ag liquid in the molten state, adding a Bi block, keeping the temperature for melting, heating the temperature to 1200 ℃, keeping the temperature for diffusion for 10min, continuing heating the temperature to 1350 ℃, adding 50g of boric acid for slagging, fishing out the charcoal and slag on the surface of the molten liquid, then pouring an alloy solution into a tundish for water atomization powder preparation, drying the obtained powder in an oven for 8h at the temperature of 150 ℃, and sieving the dried powder with a 300-mesh sieve to obtain Ag alloy powder;
3) Putting the obtained Ag alloy powder into a stainless steel disc, putting the stainless steel disc into an oxidation furnace, and oxidizing at 700 ℃ in air atmosphere for 2 hours to obtain completely oxidized alloy powder;
4) Mixing the obtained oxidized alloy powder with SnO 2 Mixing the powder in a mixer for 90min to obtain mixed powder;
5) The obtained mixed powder is pressed into powder by adopting isostatic pressing equipment
The ingot blank is placed in an oxidation sintering furnace to be sintered and diffused for 10 hours under the conditions of air atmosphere and 900 ℃ to obtain a sintered ingot;
6) Heating the obtained sintered ingot to 750 ℃, feeding the sintered ingot into an extrusion cylinder of a horizontal extruder, extruding the sintered ingot according to an extrusion ratio of 265, and extruding the sintered ingot to obtain the sintered ingot with the diameter of 750 DEG C
The wire rod of (1);
7) Drawing the wire rod obtained in the step 6) by a wire drawing machine in multiple passes
And obtaining the wire for preparing the contact.
AgSnO prepared in this example 2 (8)La 2 O 3 (4)Bi 2 O 3 (0.5) wire rod with a density of 9.83g/cm 3 The resistivity was 2.23. Mu. Omega. Cm, the tensile strength was 320MPa, and the elongation after fracture was 18%.
Example 4: preparation of
AgSnO (C) 2 (9)La 2 O 3 (2.5)Bi 2 O 3 (0.5) wire rod
1) According to the AgSnO to be prepared 2 (9)La 2 O 3 (2.5)Bi 2 O 3 (0.5) contact Material (SnO) 2 Is 9% by mass, la 2 O 3 Is 2.5 percent, bi 2 O 3 0.5% by mass, the balance being Ag), preparing pure Ag ingot, la ingot, bi block, snO 2 Powder and other raw materials for standby;
2) Putting a pure Ag ingot into a graphite crucible, simultaneously spreading a layer of blocky charcoal on the surface, putting the pure Ag ingot into a smelting furnace, heating and smelting the Ag ingot to a molten state by heating to 1050 ℃, then putting the La ingot into the molten Ag liquid in the molten state, adding the Bi block, keeping the temperature for melting, heating to 1100 ℃, keeping the temperature for diffusion for 10min, continuing heating to 1400 ℃, adding 60g of boric acid for slagging, fishing out the charcoal and slag on the surface of the molten liquid, then pouring the alloy solution into a tundish for water atomization for powder preparation, drying the obtained powder for 8h in an oven at the temperature of 150 ℃, and sieving the dried powder with a 300-mesh sieve to obtain Ag alloy powder;
3) Putting the obtained Ag alloy powder into a stainless steel disc, placing the stainless steel disc in an oxidation furnace, and oxidizing at 600 ℃ in air atmosphere for 3h to obtain completely oxidized alloy powder;
4) Mixing the obtained oxidized alloy powder with SnO 2 Mixing the powder in a mixer for 105min to obtain mixed powder;
5) The obtained mixed powder is pressed into powder by adopting isostatic pressing equipment
The ingot blank is placed in an oxidation sintering furnace to be sintered and diffused for 10 hours under the conditions of air atmosphere and 890 ℃ to obtain a sintered ingot;
6) Heating the obtained sintered ingot to 750 ℃, feeding the sintered ingot into an extrusion cylinder of a horizontal extruder, extruding the sintered ingot according to an extrusion ratio of 400, and extruding the sintered ingot to obtain the sintered ingot with the diameter of
The wire rod of (1);
7) Drawing the wire rod obtained in the step 6) by a wire drawing machine in multiple passes
And obtaining the wire for preparing the contact.
AgSnO prepared in this example 2 (9)La 2 O 3 (2.5)Bi 2 O 3 (0.5) wire rod with a density of 9.87g/cm 3 The resistivity was 2.25. Mu. Omega. Cm, the tensile strength was 320MPa, and the elongation after fracture was 20%.
Claims (5)
1. A preparation method of a silver tin oxide lanthanum oxide contact material comprises the following steps:
1) Calculating required Ag ingot, la ingot, additive and SnO according to the contact material prepared according to the requirement 2 Weighing the powder for later use;
2) Placing an Ag ingot in a smelting furnace, smelting to a molten state, adding an La ingot and an additive, continuously smelting to form uniform alloy melt, and then atomizing to prepare Ag alloy powder;
3) Placing the obtained Ag alloy powder in an oxidation furnace, heating to 600-700 ℃ in air atmosphere for oxidation to obtain oxidized alloy powder;
4) The obtained oxidized alloy powder and SnO 2 Uniformly mixing the powder to obtain mixed powder;
5) The obtained mixed powder is placed in an air atmosphere and sintered at the temperature of 890-910 ℃ to obtain a sintered ingot;
6) Heating the obtained sintered ingot, and then extruding the sintered ingot at a large extrusion ratio to obtain a wire or plate with a required specification;
7) The wire or plate is further processed into rivet-type or sheet-type contacts.
2. The method according to claim 1, wherein the additive is one or a combination of two or more selected from Bi, cu and Te in the steps 1) and 2).
3. The method according to claim 1, wherein the oxidation time in step 3) is 1.5 to 3 hours.
4. The method according to claim 1, wherein the sintering time in step 5) is 8 to 10 hours.
5. The method according to claim 1, wherein in the step 6), the extrusion ratio in the extrusion is 100 or more.
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| CN116837247A (en) * | 2023-05-22 | 2023-10-03 | 贵研中希（上海）新材料科技有限公司 | Preparation method of electric contact noble metal material for new energy field |
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| CN116837247A (en) * | 2023-05-22 | 2023-10-03 | 贵研中希（上海）新材料科技有限公司 | Preparation method of electric contact noble metal material for new energy field |
| CN116837247B (en) * | 2023-05-22 | 2024-02-06 | 贵研中希（上海）新材料科技有限公司 | Preparation method of electric contact noble metal material for new energy field |
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